Three-dimensional (3D) printer having a variously configurable printing platform assembly

This application is a divisional of U.S. patent application Ser. No. 18/615,064, filed on Mar. 25, 2024, the entire contents of which are incorporated herein by reference.

The present disclosure relates to a three-dimensional (3D) printer, and more particularly, to a 3D printer having a variously configurable printing platform assembly.

Three-dimensional (3D) printing, also known as additive manufacturing (AM), allows users to create 3D objects based on digital designs by layering materials such as plastics, metals, and ceramics over a building platform. This process offers several advantages over traditional manufacturing methods, including the ability to create complex geometries, reducing material waste, eliminating the need for molds or tooling, and reducing production time and costs. As 3D printing technology continues to mature, the technology is expected to become widely adopted in a wide range of industries including healthcare, automotive, aerospace, and consumer products.

A fused deposition modeling (FDM) 3D printer operates, generally speaking, by heating a thermoplastic filament to make the filament flowable, and depositing the flowable filament layer by layer on a platform of the FDM 3D printer. This process is relatively affordable, making FDM printers popular among consumers.

FDM 3D printing can be used to create a wide variety of objects, including prototypes, functional parts, works of art, etc. FDM 3D printing may be used to create objects that have complex geometries, the manufacturing of which would otherwise be difficult to carry out by using traditional manufacturing methods.

An FDM 3D printer includes, generally speaking, a platform on which a desired 3D object can be built, an extruder, a filament feeding system configured to feed a filament to the extruder, a movable nozzle configured to receive heated filament from the extruder in flowable form and to direct the flowable filament on the platform for constructing the 3D object, one or more pieces of supporting material that aid the construction (e.g., printing) of the 3D object but are not part of the object, and a control circuit configured to control the process of discharging heated filament over the platform to create the intended 3D object.

One of the problems with conventional FDM 3D printing technology is the difficulty in printing (e.g., discharging flowable filament material) in between two elevated structures that are separated from one another in order to connect the structure tops to one another with flowable filament material. This difficulty is because the flowable filament material has fluid-like properties, and therefore, cannot support its own weight when laid horizontally in mid-air between the elevated structures. Therefore, a supporting material (e.g., a block of material), conventionally, must be created to have a size and shape that fills a void (or empty space) between two elevated structures and must be placed in the void in order to create a bridge-like structure that can support the flowable filament while it is being discharged from the printing nozzle between the tops of the elevated structures. When the 3D object has been printed and cooled down, the supporting material can be disconnected from the structure in order to present the 3D structure in its intended configuration.

This process of custom-making a supporting structure for every project that requires connecting two or more elevated structure tops to one another is undesirable because it increases the manufacturing complexity, manufacturing cost and manufacturing time.

The present disclosure relates to a three-dimensional (3D) printer that includes a build platform having a number of variously configurable posts that can be selectively raised from under a building surface of the build platform to a desired/needed height above the building surface. This configuration can be used to structurally support a flowable filament being discharged from a nozzle of the 3D printer across a void or air gap that separates a pair of elevated structural components of a 3D object being printed. This configuration eliminates the need to manually create a supporting structure and place the supporting structure over the build platform to structurally support the flowable filament, as must be done when using conventional 3D printers.

In addition, the posts of the build platform of the present disclosure can be retracted at or below the building surface of the build platform when not needed.

Exemplary embodiments of the present disclosure will be described more fully hereinafter with reference to the accompanying drawings. The present disclosure may, however, be embodied in different forms and should not be construed as being limited to the embodiments set forth herein. Like reference numerals may refer to like elements throughout the specification. The sizes and/or proportions of the elements illustrated in the drawings may be exaggerated for clarity.

When an element is referred to as being disposed on another element, intervening elements may be disposed therebetween. In addition, elements, components, parts, etc., not described in detail with respect to a certain figure or embodiment may be assumed to be similar to or the same as corresponding elements, components, parts, etc., described in other parts of the specification.

A three-dimensional (3D) printer of the present disclosure, for example, a fused deposition modeling (FDM) 3D printer, may include a platform assembly(illustrated with reference to, the platform assembly may also be referred to as a “build platform” in this specification) on which a desired 3D object can be built, an extruder, a filament feeding assembly configured to feed a filament to the extruder, a movable nozzle configured to receive heated filament from the extruder in flowable form and to deposit the flowable filament material (while it is flowing through the nozzle) on different areas of the platform assembly for constructing the 3D object, and a controlling circuit(illustrated with reference to) for controlling an operation of the entire 3D printer for printing (e.g., creating) the 3D object based on a received 3D design file.

The filament may include, for example, a thermoplastic material. Non-limiting examples of the thermoplastic material may include, for example, polylactic acid (PLA), acrylonitrile butadiene styrene (ABS), polyethylene terephthalate glycol (PETG), etc. Alternatively, or in addition, the filament may include a metal and/or ceramic material. In a particular non-limiting embodiment, the filament is made of a thermoplastic material.

The filament feeding assembly may include the filament (e.g., rolled in a spool and/or loaded in a cartridge) and is configured to feed the filament to the extruder.

The extruder is configured to receive the filament and to apply heat and/or pressure to the filament to make the filament flowable and to cause the flowable filament material to flow outwardly through the nozzle. The extruder may include, for example, a heating element for heating the filament in order to make the filament flowable. The extruder may also include a screw mechanism. The screw mechanism may be used, for example, for directing the flowable filament material toward the nozzle.

The nozzle is configured to deposit the flowable filament material on the platform assembly in order to construct a 3D object. The nozzle may be made of a metal and/or a ceramic material, and may have an outflow diameter (or dimension across) ranging, for example, from about 0.5 mm to about 1.0 mm. These dimensions are non-limiting. The nozzle may be heated by the extruder to maintain a substantially consistent temperature and to prevent clogging.

The controlling circuitmay include hardware, a processor, and software including instructions, executable by the processor, for controlling the operation of the filament feeding assembly, the operation of the extruder, the movement of the nozzle over the platform assembly, and an operation of the platform assembly(as will be described below) to construct a 3D object on the platform assemblybased on received design data of the 3D object (which can be received by the controlling circuit from a user operating a computer and/or a computer network communicatively coupled to the 3D printer). In other words, the controlling circuitmay be configured to be communicatively coupled to the filament feeding assembly, the extruder, the nozzle and the build platform assemblyin order to control operations thereof.

An exemplary platform assembly of a 3D printer of the present disclosure will now be described in detail with reference to.

Referring to, the platform assemblymay include a first plate(e.g., a bottom plate) and a second platedisposed on the first plateand separated from the first plateby a certain distance. The second platehas a top surfaceon which 3D objects can be built. A plurality of elongated structuresextend between the first and second plates,and structurally connecting the first and second plates,to one another. A plurality of adjustable post assembliesconnect to the first and/or second plates,, and the controlling circuit.

As illustrated in, the elongated structuresand the post assembliesmay be arranged in rows and columns between the first and second plates,.

Each one of the post assembliesmay include at least one movable post. The at least one movable post is configured to be moved in a first direction (e.g., upwardly, when the platform assembly is aligned horizontally or substantially horizontally) through a respective through opening(see) in the second platein order to extend (or be raised) over the top surfaceof the second plateby a certain distance, as exemplarily illustrated infor two of the post assembliesdisposed under a 3D printed object.

The at least one movable post of each post assemblyis also configured to be moved in a second direction, opposite to the first direction thereof (e.g., downwardly) relative to its raised position, in order to reduce its height over the top surfaceof the second plateand/or to be disposed at or below the elevation of the top surfaceof the second plate(as illustrated infor the post assemblies that are not located under the 3D printed object). For example, the at least one movable post of each post assemblycan be disposed at or below the top surfaceof the second plate when the 3D printer is not in use or when the 3D printer is in use but the post(s) of a particular post assemblyneed not be raised over the top surfaceof the second plate.

This configuration, as will be described below in more detail, can be used to remove the requirement of manually creating a supporting structure for depositing a flowable filament between two elevated structural components of a 3D object to be printed and manually placing the supporting structure onto a build platform ahead of starting the 3D printing process, as must be done when using a conventional 3D printer. This is accomplished by the movable posts of each post assemblyof the present disclosure being selectively raised to a height as needed (based on the configuration of a 3D object to be printed, within the limit of the length of each movable post) to create a supporting surface over the top surfaceof the second platefor supporting the flowable filament material while it being is poured from the nozzle to extend over a gap between two elevated components of the 3D structure being printed.

In more detail, the first and second plates,may each extend along a plane formed by directions X and Y (see). The post assembliesmay each extend in a direction Z, which crosses the X and Y directions. For example, the Z direction may be perpendicular to the plane formed by the X and Y directions. For convenience of description, the plane formed by the X and Y directions may be referred to as a horizontal plane, and the Z direction may be referred to as a vertical direction. However, it is understood that the platform assembly can be tilted relative to the horizontal plane and the vertical direction as desired.

The length of the structuresin the Z direction defines the separation distance between the first and second plates,. The post assembliesmay be configured to fit entirely in the separating distance between the first and second plates,when in the retracted state, as illustrated infor the post assemblies that are not located under the 3D object, in order to avoid protruding over the top surfaceof the second platewhen not needed.

Referring to, each post assemblymay include an electric motor, an elongated and threaded member(hereinafter referred to as a threaded rod) extending in the Z direction, the threaded rodbeing connected to the motorand configured to be rotated by the motorbi-directionally, a platethreadably engaged with the threaded rodvia a through openingthereof, and a plurality of posts(e.g., two posts, as illustrated in) connected to the plateand extending in the Z direction from an upper surfaceof the plate. The platemay also be movably coupled (e.g., slidably coupled) to one or more adjoining elongated structure, for example, via hook-like structures(see), in order to prevent rotation of the plateby threaded rod. Therefore, the hook-like structuresenable the plateto slide along the length of the one or more adjoining structureit is connected to while the threaded rodis being spun by the motor.

Each electric motor, each elongated and threaded member, and each plateof each post assemblymay face a bottom surface(see) of the second plate. In other words, each electric motor, each elongated and threaded member, and each plateof each post assemblymay be, for example, visible from the bottom surfaceof the second plate.

In addition, each electric motor, each elongated and threaded member, and each plateof each post assemblymay face a top surface(see) of the first plate. In other words, each electric motor, each elongated and threaded member, and each plateof each post assemblymay be, for example, visible from the top surfaceof the first plate.

Referring to, each post assemblymay also include a first bearingrotatably connecting an upper end of the threaded rodto the second plate, a second bearingrotatably connecting a lower end of the threaded rodto the first plate, and a ring (or collar)limiting the platefrom further traveling downwardly (e.g., from further traveling toward the first plate). The ringmay be attached to, for example, the motoror to another component of the platform assembly.

The bearings,are illustrated inas being ball bearings, but the present disclosure is not limited to this configuration. For example, other kinds of bearings (e.g., friction bearings) may be used to rotatably couple the threaded rodof each post assemblyto the first and/or second plates,. Alternatively, one or more of the first and second bearings,may be omitted.

The motorof each post assemblymay be electrically connected to the controlling circuitin order to be selectively operated (e.g., to rotate) when needed by the controlling circuit. A housing (or stationary exterior component) of the motorof each post assemblymay be fixedly connected to the first plate.

The motorof each post assemblymay be selectively powered to rotate the threaded rodin a first direction A (see). The rotation of the threaded rodin the first direction A may cause the plateto be moved vertically, in the Z direction, upwardly (e.g., toward the second plate) due to the threaded engagement between the plateand the threaded rod. This configuration, in turn, can cause the postsof each post assemblyto be raised upwardly over the top surfaceof the second plate.

In each post assembly, the amount of upwardly movement of the postsdepends on the amount of rotation of the threaded rodin the first direction A (e.g., the number of turns or turning angle of the threaded rod), which, in turn, is controlled by the motor. In each post assembly, the controlling circuitcan be configured to selectively power the motorto cause the motorto rotate the threaded rodin the first direction A by a certain amount (e.g., by a certain angle or number of revolutions) in order to raise the post(s)to a desired height over the top surfaceof the second plate.

In each post assembly, the motormay also be selectively powered to rotate the threaded rodin a second direction B (see), opposite to the first direction A. In each post assembly, the rotation of the threaded rodin the second direction B may cause the plateto be moved vertically (e.g., in a-Z direction) downwardly (e.g., toward the first plate) due to the threaded engagement between the plateand the threaded rod. This configuration, in turn, can cause the postsof each post assemblyto be lowered.

In each post assembly, the controlling circuitcan be configured to selectively power the motorto rotate the threaded rodin the second direction B by a certain amount (e.g., by a certain angle or number of revolutions) in order to lower the poststo a desired height, for example, to reduce the height of the postsover the top surfaceof the second plateand/or to bring the postsentirely under the top surfaceof the second plate.

Since each post assemblycan be independently powered by the controlling circuit, the post(s)of each post assemblyof a platform assemblyof a 3D printer of the present disclosure can be raised and lowered as needed, independently of the operation of the other post assemblies, based on the configuration of a 3D structure to be created by the 3D printer. This configuration can be used to provide structural support for the flowable filament material at a range of elevations above the top surfaceof the second plateduring a printing job. In addition, this configuration eliminates the need for manually forming a supporting structure and manually placing the supporting structure on the platform, as must be done when using a conventional 3D printer, prior to starting a printing job that requires connecting two or more separated structural components of a 3D object at an elevation above the building surface of the platform.

While the post assemblydescribed with reference toincludes a pair of round bar-shaped posts, the present disclosure is not limited by the configuration.

For example, the number of posts, the shape of the posts, the size of the posts and/or the arrangement of the posts on the plate of each post assembly can be varied as needed. For example,illustrates a non-limiting configuration of a post assemblyA that includes one round bar-shaped postA.illustrates a non-limiting configuration of a post assemblyB that includes four round bar-shaped postsB.illustrates a non-limiting example of a post assemblyC that includes eight round bar-shaped postsC.illustrates a non-limiting example of a post assemblyD that includes a flat bar-shaped postD. Other configurations of posts assemblies may also include a different number of posts, a combination of posts of different shapes and/or sizes in the same post assembly, posts arranged in a geometrical arrangement and/or equally spaced from one another, as illustrated in, posts arranged in a random order and/or not equally spaced from one another, a combination thereof, etc.

The post assemblies of a platform assembly of a 3D printer of the present disclosure may be spaced apart from one another such that a separation distance in the horizontal plane (e.g., a gap in the X and/or Y directions) between a pair of adjacent posts (whether posts of the same post assembly and/or post(s) of neighboring post assemblies) is of a distance that is sufficient to structurally support a flowable filament as it is being poured over the neighboring posts in order to prevent the flowable filament material from collapsing due to its own weight above the top surfaceof the second plate. This is so because when the filament material is being discharged from the nozzle during a printing job, and although in a flowable form, the filament material still has some structural strength that enables it to temporarily lay unsupported over a certain horizontal distance (e.g., while cooling and hardening) without collapsing. The horizontal distance between neighboring posts in the platform assembly of the present disclosure may be set to be about equal to or less than the horizontal distance that can cause the flowable filament to collapse. This configuration, in combination with the variously adjustable configuration of the post assemblies of the present disclosure, can eliminate the need for manually creating and placing supporting blocks over the platform assembly of a 3D printer of the present disclosure.

Non-limiting dimensions of the first and second plates,(e.g., in the X-Y plane) can be, for example, about 200 mm by 200 mm each, about 250 mm by 250 mm each, about 300 mm to about 300 mm each, etc. A non-limiting separation distance between the first and second platesandcan range, for example, from about 100 mm to about 200 mm. A non-limiting distance between adjacent post assembliescan range, for example, from about 10 mm to about 30 mm. These dimensions can be varied as needed depending on a size of a 3D object to be printed and/or depending on the properties of the filament material used for executing the 3D print job.

The top surfaceof the second plateand/or a top surface of each postof each post assemblymay be coated with a material configured to provide good adhesion with the flowable filament material during a printing process for stability purposes (e.g., so that the 3D piece being printed does not move during the printing process), yet requiring only a reasonable amount of force to detach the finished 3D piece therefrom when completed.

illustrate a platform assemblyA of a 3D printer according to an embodiment of the present disclosure. In the embodiment of, the platform assemblyA may include a plurality of post assembliesD as illustrated in. As exemplarily illustrated in, a plurality of postsD of a plurality of post assembliesD can be selectively raised to aid the formation of a component E between components C and D of a 3D objectA at a height H without using a separate supporting under component E.

As illustrated in, top plateA of the platform assemblyA may include rectangular shaped through openingsA in order to accommodate the postsD therethrough.

Components and/or features of the 3D printer platform assembly ofthat are not described in detail may be assumed to be similar to or the same as corresponding components/features of a 3D printer platform assembly as described elsewhere in this specification.

While the elongated structuresand post assembliesin are illustrated as being regularly arranged in the drawings (e.g., in rows and columns and evenly spaced from one another), the present disclosure is not limited to this configuration. For example, the elongated structuresand/or post assemblies of the present disclosure (including the post assemblies-D, etc.) may be arranged in a staggered formation, in a different geometrical arrangement, in an irregular arrangement, or in a combination of these arrangements between the first and second plates,.

The size of each one of the first and second plates of a platform assembly of the present disclosure may be predetermined. In addition, the number of post assemblies included in a platform assembly may be predetermined.

Moreover, the location (e.g., coordinates in the X-Y plane) of each post assembly across the surface areas of the first and second plates may be predetermined, the location (e.g., coordinates in the X-Y plane) of each post included in each post assembly across the surface areas of the first and second plates may be predetermined, the maximum height by which each post of each post assembly can extend over the top surface of the second plate can be predetermined, and the current elevation of a top surface of each post of each post assembly may be determinable or known at all times during the operation of a 3D printer of the present disclosure by using the controlling circuit.

Referring to, a method of operating a 3D printer of the present disclosure includes receiving a 3D design file for printing (Step S), the 3D design file including information concerning the structural configuration of a 3D object. Step Smay include determining whether the 3D object to be printed includes a structural component, the printing of which will require structural support to be provided above the top surface of the second plate. When the answer is no, Step Smay be carried out to determine a region of the top surface of the second plate where the 3D object will be printed, and Step Smay be carried out to execute the print job in order to create the 3D object.

When the answer in step Sis yes, the method may include determining a region of the second plate where the 3D object will be built (the location can be specified by a user or determined automatically in a way that enables the 3D object to fit on the second plate) (Step S), determining which post assemblies to raise and by how much over the top surface of the second plate based on the region of the second plate on which the 3D object will be built and the structural shape and size of the 3D object (Step S), raising the post assemblies (Step S), and printing the 3D object (Step S). Step Smay include lowering the raised post assemblies upon finishing the printing job. Step Smay be optional.